I don't know where else to put this information, and it would be good to coordinate efforts anyway. So, as we basically decided to move all modules into their own repos and npm packages, I already ported the following ones myself (whenever I needed them in apps):

Let's all use the GitHub topic/tag "remotestorage-module" for modules. For the XMPP credentials I also ported the first util to it's own repo, and decided to go with the "remotestorage-util" namespace for npm package, GitHub repo and GitHub topic: